The Costa Rica coin is the only possible planchet that will fit the bill. With the story of how that could be possible, and a successful XRF proving the right alloy, you might have enough to perk up the ears of one of the real specialists in the field and yeah, this *might* be something good. I don't want to get your adrenaline going too early, though - this has to be approached logically and with all possible clear evidence gathered. Fair warning, there might be some expense associated with having an XRF test done. Those machines are hideously expensive, the price of a decent used car.

At some point I'm going to hand you off to my co-Mod, vermontensium, who is somewhat an off-metal enthusiast himself. Like, now? STONEY!

Thank you again, I will see whom I can find.Speaking of decent used cars, that is what we usually do- specializing in used police Crown Victorias, we sell 3 to 4 a month. Not exactly big business, but something we enjoy, they are great cars. If you also understand that they are professionally maintained, they become even more of a bargain. You do have to like white though, since 90% of them in our area are white.Thanks again!

Acid dipped? I read up on it, per the link. It is certainly possible. Seems to me that if it "became" this thin because of acid, all the detail would be gone? Were they struck so deeply that the detail went almost all the way through the coin? Just curious, because even as thin as it is, relative to the modern cent, it still has a lip with detail, and the strike is still visible (head, words, date, etc, and same with the reverse).I do not collect coins, I spend them. Oh well, I will toss it back in a drawer and forget it again!Thanks so much, all of you for your time.

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